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21-S-312-3000 — PIN,SPRING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

21-S-312-3000: PIN,SPRING.

The PIN,SPRING is a the manufacturer industrial component. Key specifications include diameter: 0.312 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN, material: STEEL OVERALL, overall_length: 3.000 INCHES NOMINAL IN, shear_strength: 11500 DOUBLE POUND, hardness_rating: 46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL, style_designator: SLOTTED. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-276-8677, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
21-S-312-3000
NSN: 5315-01-276-8677
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
diameter0.312 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
materialSTEEL OVERALL
overall_length3.000 INCHES NOMINAL IN
shear_strength11500 DOUBLE POUND
hardness_rating46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSLOTTED
material_thickness0.062 INCHES NOMINAL IN
NSN5315-01-276-8677
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 21-S-312-3000 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: SLOTTED
•
DIAMETER: 0.312 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.062 INCHES NOMINAL IN
•
SHEAR STRENGTH: 11500 DOUBLE POUND
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORSLOTTED
DIAMETER0.312 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
OVERALL LENGTH3.000 INCHES NOMINAL IN
MATERIAL THICKNESS0.062 INCHES NOMINAL IN
SHEAR STRENGTH11500 DOUBLE POUND
MATERIALSTEEL OVERALL
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21-S-312-3000?
21-S-312-3000 is a PIN,SPRING.
What is the NSN for 21-S-312-3000?
21-S-312-3000 is cataloged in the U.S. Government catalog under NSN 5315-01-276-8677. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.